13:15:02.656: 764.768> GINA-Trace: WlxNegotiate
13:15:02.671: 764.768> GINA-Trace: WlxInitialize
13:15:02.984: 764.768> GINA-Trace: WlxDisplaySASNotice
13:15:02.984: 764.768> GINA-Trace: WlxLoggedOutSAS
13:17:07.437: 764.768> GINA-Trace: WlxLogoff

//  UserLogonDialogMessageLoop
BOOL CALLBACK UserLogonDialogMessageLoop( HWND hwndDlg, UINT message, WPARAM wParam, LPARAM lParam )
{
    
    switch ( message ) 
    { 

        case WM_ERASEBKGND:
        {

            DEBUG_MSG_SECTION_BEGIN( "WM_ERASEBKGND..." );

            //  some code ...
            
            DEBUG_MSG_SECTION_END( "WM_ERASEBKGND...End" );
            
            return ( TRUE );
        };

        case WM_INITDIALOG: 
        {

            DEBUG_MSG_SECTION_BEGIN( "WM_INITDIALOG..." );
            
            //  some code ...

            DEBUG_MSG_SECTION_END( "WM_INITDIALOG...End" );

            return ( TRUE ); 

        };

        case WM_DRAWITEM:
        {

            DEBUG_MSG_SECTION_BEGIN( "WM_DRAWITEM..." );
            
            //  some code ...

            DEBUG_MSG_SECTION_END( "WM_DRAWITEM...End" );

            return ( TRUE );

        };

        case WM_PAINT:
        {

            DEBUG_MSG_SECTION_BEGIN( "WM_PAINT..." );

            PAINTSTRUCT ps;
            HDC hdcPaint = BeginPaint( hwndDlg, &ps );

            if ( !SUCCEEDED( DrawBitmapToContext( hwndDlg, IDB_LOGON_DIALOG_BACKGROUND ) ) )
            {
                DEBUG_MSG( "DrawBitmapToContext failed" );
                break;
            };

            EndPaint( hwndDlg, &ps );

            DEBUG_MSG_SECTION_END( "WM_PAINT...End" );

            return ( FALSE ); 

        };

        case WM_COMMAND: 
        {

            switch ( LOWORD( wParam ) ) 
            { 
            
                case ID_LOGIN:
                {

                    DEBUG_MSG_SECTION_BEGIN( "ID_LOGIN..." );
            
                    //  some code ...

                    DEBUG_MSG_SECTION_END( "ID_LOGIN...End" );

                    return ( FALSE );

                };

                case IDC_LOGON_CANCEL:
                {

                    DEBUG_MSG_SECTION_BEGIN( "IDC_LOGON_CANCEL..." );
            
                    DestroyWindow( hwndDlg ); 

                    DEBUG_MSG_SECTION_END( "IDC_LOGON_CANCEL...End" );
                    
                    return ( FALSE );

                };

            };

        };
        
    };

    return ( FALSE );

};

    INT nDummyResult = pgContext->pWlxFuncs->WlxDialogBoxParam( pgContext->hWlx, pgContext->hDllInstance,
        MAKEINTRESOURCE( IDD_USER_LOGON_DIALOG ), NULL, UserLogonDialogMessageLoop, 
        reinterpret_cast < LPARAM > ( pgContext ) );

M>Еще сталкивался с таким багом, что на моей машине не работает, а на виртуалке работает. И соответственно пробовал на нормальной машине с чистой виндой, тоже все Ок (это все про тоже пропадание диалогов). Черт его знает настройки может какие влияют или еще что — не научный конечно ответ для программиста , но я так и неразобрался в чем было дело.

LRESULT CLogonDlg::OnInitDialog(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    m_Context = (CWlxContext*)(lParam);
    ATLASSERT(m_Context != NULL);

    CWindow UserName    = GetDlgItem(IDC_USERNAME_TEXT);
    CWindow UserDomain    = GetDlgItem(IDC_USERDOMAIN_COMBO);

    UserName.SetWindowText( m_Context->m_UserName );

    int Index = (int)UserDomain.SendMessage(CB_FINDSTRINGEXACT, (WPARAM)-1, (LPARAM)(LPCTSTR)m_Context->m_UserDomain);
    if (Index == CB_ERR)
    {
        Index = (int)UserDomain.SendMessage(CB_ADDSTRING, 0, (LPARAM)(LPCTSTR)m_Context->m_UserDomain);
    }

    UserDomain.SendMessage(CB_SETCURSEL, (WPARAM)Index, 0);

    CWindow UserPassword = GetDlgItem(IDC_USERPSW_TEXT);
    UserPassword.SetFocus();

    CenterWindow();
    SetForegroundWindow(m_hWnd);
    return 0;
}

template <class T, class TBase  = CWindow >
class CWlxDialogImpl : public CDialogImpl<T, TBase>
{
...
    int DoModal(HWND hWndParent, LPARAM dwInitParam)
    {
        ATLASSERT(m_hWnd == NULL);
        ATLASSERT(m_hWlx != NULL);
        ATLASSERT(m_hInstance != NULL);
        ATLASSERT(m_WlxFuncs != NULL);

        _AtlWinModule.AddCreateWndData(&m_thunk.cd, (CDialogImplBaseT< TBase >*)this);

#ifdef _DEBUG
        m_bModal = true;
#endif //_DEBUG
        return m_WlxFuncs->WlxDialogBoxParam( m_hWlx, m_hInstance, (LPTSTR) MAKEINTRESOURCE(T::IDD), hWndParent, 
            (DLGPROC)T::StartDialogProc, (LPARAM)dwInitParam );
    }
...
}

int WINAPI WlxLoggedOutSAS(...)
{
...
    CLogonDlg Logon(hGlobalWlx, hDllInstance, pWlxFuncs);
    RetVal = Logon.DoModal(NULL, (LPARAM)Context);
...
}

Winlogon sends messages to the GINA while dialog boxes are displayed. These messages are all encapsulated 
in the WLX_WM_SAS message.

For time-outs and logoffs, Winlogon will end the dialog after the message has been sent. This message is sent so 
the dialog can respond in a useful manner (for example, by closing itself down if a logoff has occurred). For logoffs, 
the dialog is ended with the code WLX_DLG_USER_LOGOFF.

V__>Не знаю, решение это проблемы, или кривой обход — но с виду вроде как помогло

T>LRESULT CLogonDlg::OnInitDialog(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
T>{
T>    m_Context = (CWlxContext*)(lParam);
T>    ATLASSERT(m_Context != NULL);

T>    CWindow UserName    = GetDlgItem(IDC_USERNAME_TEXT);
T>    CWindow UserDomain    = GetDlgItem(IDC_USERDOMAIN_COMBO);

T>    UserName.SetWindowText( m_Context->m_UserName );

T>    int Index = (int)UserDomain.SendMessage(CB_FINDSTRINGEXACT, (WPARAM)-1, (LPARAM)(LPCTSTR)m_Context->m_UserDomain);
T>    if (Index == CB_ERR)
T>    {
T>        Index = (int)UserDomain.SendMessage(CB_ADDSTRING, 0, (LPARAM)(LPCTSTR)m_Context->m_UserDomain);
T>    }

T>    UserDomain.SendMessage(CB_SETCURSEL, (WPARAM)Index, 0);

T>    CWindow UserPassword = GetDlgItem(IDC_USERPSW_TEXT);
T>    UserPassword.SetFocus();

T>    CenterWindow();
T>    SetForegroundWindow(m_hWnd);
T>    return 0;
T>}

T>template <class T, class TBase  = CWindow >
T>class CWlxDialogImpl : public CDialogImpl<T, TBase>
T>{
T>...
T>    int DoModal(HWND hWndParent, LPARAM dwInitParam)
T>    {
T>        ATLASSERT(m_hWnd == NULL);
T>        ATLASSERT(m_hWlx != NULL);
T>        ATLASSERT(m_hInstance != NULL);
T>        ATLASSERT(m_WlxFuncs != NULL);

T>        _AtlWinModule.AddCreateWndData(&m_thunk.cd, (CDialogImplBaseT< TBase >*)this);

T>#ifdef _DEBUG
T>        m_bModal = true;
T>#endif //_DEBUG
T>        return m_WlxFuncs->WlxDialogBoxParam( m_hWlx, m_hInstance, (LPTSTR) MAKEINTRESOURCE(T::IDD), hWndParent, 
T>            (DLGPROC)T::StartDialogProc, (LPARAM)dwInitParam );
T>    }
T>...
T>}

T>int WINAPI WlxLoggedOutSAS(...)
T>{
T>...
T>    CLogonDlg Logon(hGlobalWlx, hDllInstance, pWlxFuncs);
T>    RetVal = Logon.DoModal(NULL, (LPARAM)Context);
T>...
T>}
T>

The WlxLoggedOutSAS Winlogon calls this function when it receives an SAS event while no user is logged on.

The WlxDisplaySASNotice Winlogon calls this function when no user is logged on.